From: A novel stability-indicating method for known and unknown impurities profiling for diltiazem hydrochloride pharmaceutical dosage form (tablets)
Compound
Concentration
µg mL−1
Multiple
R
Regression equation
F value
P value
Diltiazem hydrochloride
0.12 to 4.84
1.000
y = 63810.96x + 1124.7
11,398
< 0.05
EP Imp.-F
0.18 to 5.65
0.999
y = 78198.34x + 178.13
29,206